(CNN) - Voters in three states head to the polls Tuesday, and in one of those states history might be made:
South Carolina Republicans could make state Rep. Nikki Haley their first female gubernatorial nominee. She's in a runoff against U.S. Rep. Gresham Barrett.
Haley just missed out on winning the nomination outright in the June 8 primary, capturing 49 percent of the vote in a four-candidate field. She was short of the 50 percent plus one needed to take the nomination.
Once facing long odds for the GOP nomination, Haley rose in the polls thanks in part to endorsements by former Massachusetts Gov. Mitt Romney and former Alaska Gov. Sarah Palin.